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3. Principles of Consolidation, Investments in Subsidiaries, Acquisitions Under Approval and Business Combination (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
SummaryOfPrinciplesOfConsolidationLineItems [Line Items]    
(-) Non-controlling interest R$ 339,571 R$ 30,935
Acquisition Date    
SummaryOfPrinciplesOfConsolidationLineItems [Line Items]    
Temporary consideration transferred 356,077  
Total assets acquired 765,673  
(-) Total liabilities assumed (350,666)  
(-) Non-controlling interest (182,603)  
Temporary goodwill R$ 123,673